From Cppreference
Returns the number of elements in the container, i.e. std::distance(begin(), end()).
[edit] Parameters
(none)
[edit] Return value
the number of elements in the container
[edit] Exceptions
[edit] Complexity
constant
[edit] See also
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| returns the number of elements that can be held in currently allocated storage
(public member function)
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| checks whether the container is empty
(public member function)
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| returns the maximum possible number of elements
(public member function)
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| changes the number of elements stored
(public member function)
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